That should be the cell membrane. The cell membrane acts as a filter in and out.
Answer:
1. We all are at risk for getting and spreading the flu. Having the flu may keep you home from work or school, not to mention making you feel pretty miserable for a week or two. If you have asthma or other lung diseases, you are at higher risk of developing complications from the flu.
Explanation:
thats all i know hope you like it
B, ocean trenches are formed after a underwater volcano has erupted.<span />
